WO2011104735A1 - Device for synchronizing the seat and backrest of a chair - Google Patents
Device for synchronizing the seat and backrest of a chair Download PDFInfo
- Publication number
- WO2011104735A1 WO2011104735A1 PCT/IT2010/000082 IT2010000082W WO2011104735A1 WO 2011104735 A1 WO2011104735 A1 WO 2011104735A1 IT 2010000082 W IT2010000082 W IT 2010000082W WO 2011104735 A1 WO2011104735 A1 WO 2011104735A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- seat frame
- crank
- seat
- chair
- frame
- Prior art date
Links
Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C1/00—Chairs adapted for special purposes
- A47C1/02—Reclining or easy chairs
- A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
- A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
- A47C1/03261—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means
- A47C1/03272—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest characterised by elastic means with coil springs
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C1/00—Chairs adapted for special purposes
- A47C1/02—Reclining or easy chairs
- A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
- A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C1/00—Chairs adapted for special purposes
- A47C1/02—Reclining or easy chairs
- A47C1/031—Reclining or easy chairs having coupled concurrently adjustable supporting parts
- A47C1/032—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest
- A47C1/03255—Reclining or easy chairs having coupled concurrently adjustable supporting parts the parts being movably-coupled seat and back-rest with a central column, e.g. rocking office chairs
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C7/00—Parts, details, or accessories of chairs or stools
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47C—CHAIRS; SOFAS; BEDS
- A47C7/00—Parts, details, or accessories of chairs or stools
- A47C7/36—Support for the head or the back
- A47C7/40—Support for the head or the back for the back
- A47C7/46—Support for the head or the back for the back with special, e.g. adjustable, lumbar region support profile; "Ackerblom" profile chairs
Definitions
- the present invention relates to a device for synchronizing the tilt of the seat frame and of the back frame of a chair, or of any other seating means, relatively to the corresponding base, that is able to univocally correlate the mutual tilt of such frames and to determine such a tilt as a function of the user weight and of the type of rest the user is exercising onto the chair back.
- the French Patent FR 2045120 in the name of DUPART, teaches to realize such a synchronizing device for tilting the seat frame and the chair back frame by a four- bar linkage provided with only two cranks hinged between the base and the frame of the seat, and a lever with two arms, having a fulcrum on the same base, and wherein an arm is integral with the chair back frame and on the contrary the other arm is acting onto the rear portion of the seat frame, raising or pulling it down as a function of the angle and the tilting direction of the chair back.
- the DUPART Patent because of the geometry of the described synchronizing device, does not provide, while varying the chair back tilt angle, the contemporaneous raising, or pulling down, of the front portion and the rear portion of the seat in such a way that this raising or pulling down of the front portion of the seat would be greater than the raising or pulling down of the rear portion of the seat.
- the German Application DE 37 35 256 in the name of NIKOV, describes a synchronizing device of the tilt of the back and seat of a chair wherein the four - bar linkage comprises two cranks, one in the front and the other in the rear, that are hinged between the seat frame and the base of the chair, and wherein the seat frame is integral with the rear crank of such a four - bar linkage.
- the front and rear cranks are tilted in different directions relatively to the vertical, that is if the front crank is tilted with an acute angle in the anticlockwise direction relatively to the vertical, then the rear crank is tilted with an acute angle in the clockwise direction relatively to the vertical, and/or vice versa.
- the International Patent Application WO 2008/067947 in the name of SATO OFFICE, refers to a device for synchronizing the tilt of the seat frame and the back frame of a chair comprising a four - bar linkage, wherein the two cranks are hinged to the chair base and, respectively, to the front and rear portions of the seat frame, and a lever with two arms having a fulcrum on the end extension of the rear crank.
- One of the two arms of such a lever is constrained, by means of a runner, to the front portion of the seat frame, whereas the other arm is integral with the back frame.
- the device for synchronizing the tilt of the back and the seat of a chair comprises a back frame, a seat frame and a support constrained to, or coincident (integral) with, the base of the chair, as well as at least one first - front - crank hinged to such a support and a front portion of the seat frame, and at least one second - rear - crank hinged to such a support and a rear portion of the seat frame, such first and second crank constituting a four - bar linkage with the seat frame.
- the device of the present invention provides that the back frame of the chair is integral with the afore said first (front) crank.
- the device comprises as well elastic means for returning the seat frame towards the support, preferably composed of at least one spring, for example a cylindrical helical spring, interposed between the pin of the afore said second (rear) crank on the seat frame and a front portion of the afore said chair support.
- at least one spring for example a cylindrical helical spring
- first (front) and second (rear) crank of the mentioned device are sloping in the same sense relatively to the vertical, the respectively subtended angles of such cranks relatively to the vertical are mutually different.
- the herein claimed geometry of the device may allow the contemporaneous raising or pulling down of the front portion and of the rear portion of the seat frame, as will be evident to a person skilled of the art, in such a way that such a raising - or pulling down - of the front portion of the seat frame, along the vertical, could appear quantitatively greater than the raising - or pulling down - of the corresponding rear portion of the seat frame.
- figure 1 is a partial side view of a device for synchronizing the tilt of the back and the seat of a chair, according to the present invention, depicted with the chair back disposed in its greatest tilting position;
- figure 2 is a partial side view of the device of figure 1 , depicted with the chair back disposed in its lowest tilting position;
- figure 2 is a scheme of the chair provided with a device depicted in figure 1 or 2;
- figure 4 is a partial mechanical scheme of the device of figures 1 and 2.
- the device 1 for synchronizing the tilt of the back and the seat of a chair herein shown comprises a seat frame 2, to which a chair seat is associated with in a known way, a back frame 13, to which the chair back is associated with, and a support 5 constrained to the base 14 of the chair, for example by clutching a pin, integral to the same base 14, into a sleeve 12 of which the support 5 could be provided with.
- the synchronizing device 1 comprises as well at least one first front crank 3, and at least one second rear crank 4, which connect the seat frame 2 to the support 5, forming with such a seat frame 2 a four - bar linkage 2, 3, 4.
- the front crank 3 is hinged at its ends, by the pins 6 and 7, respectively to the support 5 and to a front portion 2f of the seat frame 2, whereas the rear crank 4 is hinged, thanks to the pins 8 and 9, respectively to the support 5 and a to rear portion 2r of the same seat frame 2.
- the synchronizing device provides that the back frame 13 is integral with the front crank 3 of the four - bar linkage 2, 3, 4.
- the back frame 13 is made integral with a rear portion 3r of the front crank 3.
- the back frame 13 is provided with, and because the forces acting on the chair back are transmitted to the front crank 3 of the device, on which an usually lower load is acting when the user rests his/her weight on the seat, the regulation of the chair back tilt, and then of the seat, by the user is extremely effective and it causes the easy obtaining of chair configurations allowing the user comfortable postures, based on his/her weight.
- the synchronizing device 1 herein represented may comprise two identical four - bar linkages, mutually parallel, placed at the two sides of the seat frame 2, so that the back frame 13 would seem, in this case, integral with the front cranks of the two parallel four - bar linkages of which such a device would be provided with.
- the rear portion 2r of the seat frame 2 and the support 5 are reciprocally connected to a spring 10 countering the displacement of the same rear portion 2r of the seat frame 2 moving away from the support 5, that is countering the displacement, rotationally anticlockwise in the figures, of the same seat frame 2 from its initial position; initial position wherein such a seat frame 2 is substantially horizontal and the back frame 13 is in its position of lowest tilt relatively to the vertical.
- the spring 10 is a helical cylindrical spring, acting in traction, and constrained (hinged) in its ends, respectively to the support 5, by a pin 11 , and to the rear portion 2r of the seat frame 2 thanks to a pin 9, that in its turn constrains the afore said rear crank 4 to such a rear portion 2r of the seat frame 2.
- the return springs 10 may be two or more, interposed between the seat frame 2 and the support 5.
- the spring 10 may be replaced with any other returning elastic means known in the art.
- the four - bar linkage 2, 3, 4, that could comprise retainers stopping the clockwise and/or anticlockwise rotation of one or the other crank 3, 4, is shaped in such a way that, upon the frame rotation of the chair back 13 towards greater tilt angles relatively to the vertical, and then upon the anticlockwise rotation of the front crank 3 about its pin 6 in the figures, the contemporaneous raising of the front portion 2f and the rear portion 2r of the seat frame 2 occurs, in such a way that the raising extent of the front portion 2f, along the vertical is greater than the extent of the contemporaneous raising of the rear portion 2f.
- the non - excessively different length of the two cranks 3 and 4 (it has to be considered that the effective length of the crank 3 is provided by the distance between the pins 6 and 7) and the distance between the pins 9 and 7 and between the pins 6 and 8, and then the point that the angle subtended by the front crank 3 relatively to the horizontal (anticlockwise in figures) is acute, whereas the angle subtended by the rear crank 4 relatively to the horizontal (anticlockwise), will impart more regulating comfort to the device object of the present invention.
- the device 1 may further comprise one or more additional mechanisms for blocking the tilt of the chair back, in themselves known in the art, in addition to the before mentioned limit stops for limiting the rotation extent of one and/or the other crank 3, 4, in one or both rotation sense, such mechanisms preventing, when activated by the user, further rotations of the back frame 13 and the seat frame 2 and then further movements of the four - bar linkage 2, 3, 4.
- the spring 10 acting in traction, tends to maintain the seat frame 2 in its initial position, that is substantially horizontal.
- a substantially horizontal position of the seat frame 2 corresponds the position of lowest tilt relatively to the vertical of the back frame 13, thanks to the interlocking constrain between the same back frame 3 and the front crank 3.
- the particular shape of the four - bar linkage 2, 3, 4 herein illustrated, according to a preferred aspect of the present invention, will cause the raising of both the rear portion 2r and the front portion 2f of the seat frame 2, during the afore described rotation, although the raising of the rear portion 2r is lower, along the vertical, than that along the front portion 2f of the seat frame 2.
Landscapes
- Health & Medical Sciences (AREA)
- Dentistry (AREA)
- General Health & Medical Sciences (AREA)
- Chairs Characterized By Structure (AREA)
- Chairs For Special Purposes, Such As Reclining Chairs (AREA)
Abstract
Description
Claims
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/IT2010/000082 WO2011104735A1 (en) | 2010-02-26 | 2010-02-26 | Device for synchronizing the seat and backrest of a chair |
PL10711761T PL2538820T3 (en) | 2010-02-26 | 2010-02-26 | Device for synchronizing the seat and backrest of a chair |
BR112012021407A BR112012021407B1 (en) | 2010-02-26 | 2010-02-26 | device to synchronize the inclination of the backrest and seat of a chair |
KR1020117010315A KR101661949B1 (en) | 2010-02-26 | 2010-02-26 | Device for synchronizing the seat and backrest of a chair |
US13/580,028 US9161627B2 (en) | 2010-02-26 | 2010-02-26 | Device for synchronizing the seat and backrest of a chair |
CN201080064508.8A CN102781281B (en) | 2010-02-26 | 2010-02-26 | For the seat support of synchronous chair and the device of the chair back |
CA2788083A CA2788083C (en) | 2010-02-26 | 2010-02-26 | Device for synchronizing the seat and backrest of a chair |
EP10711761.6A EP2538820B1 (en) | 2010-02-26 | 2010-02-26 | Device for synchronizing the seat and backrest of a chair |
HK13103086.4A HK1175674A1 (en) | 2010-02-26 | 2013-03-12 | Device for synchronizing the seat and backrest of a chair |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/IT2010/000082 WO2011104735A1 (en) | 2010-02-26 | 2010-02-26 | Device for synchronizing the seat and backrest of a chair |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2011104735A1 true WO2011104735A1 (en) | 2011-09-01 |
Family
ID=42664763
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IT2010/000082 WO2011104735A1 (en) | 2010-02-26 | 2010-02-26 | Device for synchronizing the seat and backrest of a chair |
Country Status (9)
Country | Link |
---|---|
US (1) | US9161627B2 (en) |
EP (1) | EP2538820B1 (en) |
KR (1) | KR101661949B1 (en) |
CN (1) | CN102781281B (en) |
BR (1) | BR112012021407B1 (en) |
CA (1) | CA2788083C (en) |
HK (1) | HK1175674A1 (en) |
PL (1) | PL2538820T3 (en) |
WO (1) | WO2011104735A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT202000002332A1 (en) | 2020-02-06 | 2021-08-06 | Donati Spa | SWINGING MECHANISM FOR A CHAIR OR ARMCHAIR |
IT202200001481A1 (en) | 2022-01-28 | 2023-07-28 | Donati Spa | SWING MECHANISM FOR A CHAIR OR CHAIR |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101398686B1 (en) * | 2013-10-10 | 2014-05-27 | 주식회사 시디즈 | Tilting type chair |
CN106413479A (en) * | 2014-03-28 | 2017-02-15 | 多纳蒂股份公司 | Device for synchronizing tilt of the backrest and seat of chair |
WO2016168185A1 (en) | 2015-04-13 | 2016-10-20 | Steelcase Inc. | Seating arrangement |
US10194750B2 (en) | 2015-04-13 | 2019-02-05 | Steelcase Inc. | Seating arrangement |
US11259637B2 (en) | 2015-04-13 | 2022-03-01 | Steelcase Inc. | Seating arrangement |
KR101832443B1 (en) | 2015-06-26 | 2018-02-27 | 한국생산기술연구원 | Which is synchronized tilting action of the seat and the backrest of the seat raising operation according to weight |
EP3949807B1 (en) * | 2016-03-31 | 2023-09-06 | Franklin Products, Inc. | Method for installing a seating diaphragm to a seating frame |
KR102018349B1 (en) | 2016-11-30 | 2019-09-06 | 한국생산기술연구원 | Slide chair tilt sink in response to weight |
CN109419196B (en) * | 2017-08-30 | 2024-01-23 | 永艺家具股份有限公司 | Back seat synchronous linkage device for office chair |
ES2800425T3 (en) | 2018-04-17 | 2020-12-30 | L&P Property Man Co | Tilt mechanism of a chair and chair |
CN113507865A (en) | 2019-02-21 | 2021-10-15 | 斯特尔凯斯公司 | Body support assembly and methods for use and assembly thereof |
US11357329B2 (en) | 2019-12-13 | 2022-06-14 | Steelcase Inc. | Body support assembly and methods for the use and assembly thereof |
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US2746520A (en) * | 1952-04-25 | 1956-05-22 | Ducrot Albert | Reclining chair |
FR2045120A5 (en) | 1969-06-03 | 1971-02-26 | Dupart Jean | |
DE8713972U1 (en) * | 1987-10-17 | 1987-11-26 | Nikov, Ljubomir, 6457 Maintal, De | |
EP0613642A1 (en) * | 1993-03-05 | 1994-09-07 | Drabert Söhne GmbH & Co. | Chair, especially office chair |
US5397165A (en) * | 1992-10-20 | 1995-03-14 | Paltechnica Nitzanim | Synchronous movement adjustable seat support |
EP1396213A1 (en) * | 2002-09-07 | 2004-03-10 | Bock-1 GmbH & Co. | Synchronised mecanism for office chairs |
DE202005011725U1 (en) * | 2005-07-27 | 2006-12-07 | Sander, Armin | Chair, especially office chair |
WO2008067947A1 (en) | 2006-12-04 | 2008-06-12 | Sato Office Gmbh | Seat having a seat panel and a backrest |
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DE10122945A1 (en) * | 2001-05-11 | 2002-12-12 | Armin Sander | Chair, especially office chair |
DE10226717B4 (en) * | 2002-06-14 | 2008-04-17 | C. Rob. Hammerstein Gmbh & Co. Kg | Frame of a motor vehicle seat with a seat support and a cushion support |
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DE102006047889B4 (en) | 2006-10-10 | 2008-10-23 | Interstuhl Büromöbel GmbH & Co. KG | Seating furniture, in particular office chair |
CN201091373Y (en) | 2007-08-15 | 2008-07-30 | 多纳蒂合资公司 | Rocking chair synchronization leaning overhead mechanism |
US7926879B2 (en) * | 2007-09-20 | 2011-04-19 | Herman Miller, Inc. | Load support structure |
KR101564800B1 (en) * | 2009-02-25 | 2015-10-30 | 도나티 에스.피.에이. | Device for synchronizing the tilt of a chair back and seat |
-
2010
- 2010-02-26 KR KR1020117010315A patent/KR101661949B1/en active IP Right Grant
- 2010-02-26 CN CN201080064508.8A patent/CN102781281B/en active Active
- 2010-02-26 PL PL10711761T patent/PL2538820T3/en unknown
- 2010-02-26 EP EP10711761.6A patent/EP2538820B1/en active Active
- 2010-02-26 BR BR112012021407A patent/BR112012021407B1/en active IP Right Grant
- 2010-02-26 WO PCT/IT2010/000082 patent/WO2011104735A1/en active Application Filing
- 2010-02-26 CA CA2788083A patent/CA2788083C/en active Active
- 2010-02-26 US US13/580,028 patent/US9161627B2/en active Active
-
2013
- 2013-03-12 HK HK13103086.4A patent/HK1175674A1/en unknown
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
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US2746520A (en) * | 1952-04-25 | 1956-05-22 | Ducrot Albert | Reclining chair |
FR2045120A5 (en) | 1969-06-03 | 1971-02-26 | Dupart Jean | |
DE8713972U1 (en) * | 1987-10-17 | 1987-11-26 | Nikov, Ljubomir, 6457 Maintal, De | |
DE3735256A1 (en) | 1987-10-17 | 1989-04-27 | Ljubomir Nikov | Chair or armchair with synchronously adjustable inclination of backrest and seat |
US5397165A (en) * | 1992-10-20 | 1995-03-14 | Paltechnica Nitzanim | Synchronous movement adjustable seat support |
EP0613642A1 (en) * | 1993-03-05 | 1994-09-07 | Drabert Söhne GmbH & Co. | Chair, especially office chair |
EP1396213A1 (en) * | 2002-09-07 | 2004-03-10 | Bock-1 GmbH & Co. | Synchronised mecanism for office chairs |
DE202005011725U1 (en) * | 2005-07-27 | 2006-12-07 | Sander, Armin | Chair, especially office chair |
WO2008067947A1 (en) | 2006-12-04 | 2008-06-12 | Sato Office Gmbh | Seat having a seat panel and a backrest |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT202000002332A1 (en) | 2020-02-06 | 2021-08-06 | Donati Spa | SWINGING MECHANISM FOR A CHAIR OR ARMCHAIR |
DE202020005916U1 (en) | 2020-02-06 | 2023-04-13 | Donati S.P.A. | Swing mechanism for a chair or armchair |
IT202200001481A1 (en) | 2022-01-28 | 2023-07-28 | Donati Spa | SWING MECHANISM FOR A CHAIR OR CHAIR |
Also Published As
Publication number | Publication date |
---|---|
CA2788083A1 (en) | 2011-09-01 |
PL2538820T3 (en) | 2014-07-31 |
EP2538820A1 (en) | 2013-01-02 |
US9161627B2 (en) | 2015-10-20 |
KR20130038121A (en) | 2013-04-17 |
BR112012021407A2 (en) | 2018-04-03 |
HK1175674A1 (en) | 2013-07-12 |
US20120313414A1 (en) | 2012-12-13 |
EP2538820B1 (en) | 2014-01-22 |
CN102781281A (en) | 2012-11-14 |
KR101661949B1 (en) | 2016-10-04 |
BR112012021407B1 (en) | 2020-06-09 |
CN102781281B (en) | 2016-05-11 |
CA2788083C (en) | 2017-10-24 |
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